[llvm] r279875 - TableGen: Switch from a std::map to a DenseMap in CodeGenSubRegIndex. NFC

[Justin Bogner via llvm-commits]

Author: bogner
Date: Fri Aug 26 17:29:36 2016
New Revision: 279875

URL: http://llvm.org/viewvc/llvm-project?rev=279875&view=rev
Log:
TableGen: Switch from a std::map to a DenseMap in CodeGenSubRegIndex. NFC

This mapping is between pointers, which DenseMap is particularly good
at. Most targets aren't really affected, but if there's a lot of
subregister composition this can shave off a good chunk of time from
generating registers.

Modified:
    llvm/trunk/utils/TableGen/CodeGenRegisters.h

Modified: llvm/trunk/utils/TableGen/CodeGenRegisters.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/CodeGenRegisters.h?rev=279875&r1=279874&r2=279875&view=diff
==============================================================================
--- llvm/trunk/utils/TableGen/CodeGenRegisters.h (original)
+++ llvm/trunk/utils/TableGen/CodeGenRegisters.h Fri Aug 26 17:29:36 2016
@@ -74,8 +74,7 @@ namespace llvm {
     std::string getQualifiedName() const;
 
     // Map of composite subreg indices.
-    typedef std::map<CodeGenSubRegIndex *, CodeGenSubRegIndex *,
-                     deref<llvm::less>> CompMap;
+    typedef DenseMap<CodeGenSubRegIndex *, CodeGenSubRegIndex *> CompMap;
 
     // Returns the subreg index that results from composing this with Idx.
     // Returns NULL if this and Idx don't compose.